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Sci.Rep:华中农业大学张学振研究组发表蓝藻最新研究成果

摘要 : 近日,自然出版集团旗下综合类刊物《Scientific Reports》在线发表了华中农业大学水产品质量安全团队的最新研究成果“Are fish fed with cyanobacteria safe,nutritious and delicious? A laboratory study”。水产学院博士生梁花蕾为第一作者,张学振副教授为通讯作者。

 近日,自然出版集团旗下综合类刊物《Scientific Reports》在线发表了华中农业大学水产品质量安全团队的最新研究成果“Are fish fed with cyanobacteria safe,nutritious and delicious? A laboratory study”。水产学院博士生梁花蕾为第一作者,张学振副教授为通讯作者。该研究揭示了将蓝藻粉作为替代蛋白源添加到鱼饲料中加以利用这一研究假设的实验结果,对于评估蓝藻水华污染对水产品质量安全的影响具有重要借鉴意义。

伴随着全球范围内水体富营养化的日益加剧,淡水水体蓝藻水华频繁暴发。蓝藻水华的暴发不仅影响景观、散发臭味,还对饮用水及水产品质量安全带来了巨大的威胁。世界卫生组织(WHO)推荐的饮水中的藻毒素标准为1.0 ppb,推荐的日容许摄入量(Tolerable daily intake, TDI)为0.04 µg/kg BW (体重),因产毒蓝藻细胞破裂而释放的藻毒素对这一限值造成严峻挑战。

与此同时,蓝藻(或蓝细菌)是地球上最早出现的光合自养生物,具有特别强的环境适应能力。蓝藻含有30-50%的蛋白含量,甚至高于豆粕中的蛋白含量。在当前饲料蛋白原日益紧缺的形势下,有学者提出将蓝藻粉作为替代蛋白源添加到饲料中加以利用的设想。我校水产品质量安全团队采用10%、20%、30%、40%的蓝藻粉添加比例以替代豆粕的含量并制成饲料养殖鲫鱼4个月。研究结果表明,与对照组相比,低比例添加(10%、20%)能显著促进鲫鱼生长,而高添加组(30%、40%)不但显著抑制生长,而且导致鱼体肌肉品质显著下降、异味物质含量增加,藻毒素含量趋近或超过WHO规定的TDI值,存在一定的安全隐患。实验将蓝藻作为饲料蛋白源加以开发利用,藻毒素去除是至关重要的一步。

原文链接:

Are fish fed with cyanobacteria safe, nutritious and delicious? A laboratory study

原文摘要:

Toxic cyanobacterial blooms, which produce cyclic heptapeptide toxins known as microcystins, are worldwide environmental problems. On the other hand, the cyanobacteria protein (30–50%) has been recommended as substitute protein for aquaculture. The present laboratory study verified the feasibility of cyanobacteria protein substitution and risk assessment. Goldfish were fed diets supplemented lyophilised cyanobacteria powder for 16 weeks with the various doses: 0% (control), 10%, 20%, 30% and 40%. Low doses (10% and 20%) promoted growth wheras high doses (30% and 40%) inhibited growth. In cyanobacteria treated fish, the proximate composition of ash, crude fat content and crude protein content decreased in 16 weeks; the saturated fatty acid (SFA) content significantly increased; the n-3 polyunsaturated fatty acid content, collagen content and muscle pH significantly decreased; cooking loss percents increased significantly. Muscle fiber diameter and myofibril length were negatively correlation. Additionally, flavour compounds (e.g., amino acids, nucleotides, organic acids and carnosine) changed significantly in the treated fish, and odour compounds geosmin and 2-methylisoborneol increased significantly. The estimated daily intake (EDI) of microcystins in muscle was close to or exceeded the World Health Organization (WHO) tolerable daily intake (TDI), representing a great health risk. Cyanobacterie is not feasible for protein sources use in aquaculture.

来源: Scientific Reports 浏览次数:0

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